Message or a type that has MessageContractAttribute and other parameters of different types

Question

I\'m developing WCF services where some classes have the [MessageContract] attribute, and some don\'t.

When I try to run the services I get this error mess

Answer 1

This basically means that a particular operation is using a combination of message contract types and primitive types in any of the following combinations:

MixType1: Contract type and primitive types as operation parameters
MixType2: Contract type as a parameter and primitive type as return type
MixType3: Primitive type as a parameter and Contract type as return type

Any of the scenarios listed above would generate the error.